Memcache Helper Class

Cache.php

<?php

/**
 * Helper class for storing and fetching cache
 * data by passing through keys. Setting up
 * Memcache tutorial: http://code.tutsplus.com/tutorials/turbocharge-your-website-with-memcached--net-23939
 */
class Cache
{

    protected $memcache;

    public function __construct()
    {
        $this->memcache = new Memcache;
        $this->memcache->connect(MEMCACHED_HOST, MEMCACHED_PORT);
    }

    public function store($key, $values = [])
    {
        $this->memcache->set($key, $values);
    }

    public function fetch($key)
    {
        $cache = $this->memcache->get($key);

        if($cache) return $cache;

        return false;
    }

}

index.php

<?php

requre_once 'Cache.php';

$cache = new Cache;

$cache->store('key_id_1', [
    'id' => 1,
    'name' => 'Table',
    'description' => 'Wooden table with four working legs',
    'price' => 9.99
]);

echo '<pre>', print_r($cache->fetch('key_id_1'), true);

Long Version
Memcache Install guide

short & Sweet Version

Install

sudo apt-get install memcached

Config File

/etc/memcached.conf

Default host: 127.0.0.1
Default port: 11211
Default memory: 64MB

Install Memcache with pecl

sudo pecl install memcache

If pecl didn't work, then try this and try again:

sudo apt-get install php5-dev

Update php.ini
Add extension=memcache.so to the bottom of the file

sudo nano /etc/php5/apache2/php.ini